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MaskedFlag.java
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109 lines (99 loc) · 2.99 KB
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/*
* Copyright © 2016-2025 The LmdbJava Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.lmdbjava;
import static java.util.Objects.requireNonNull;
import java.util.Collection;
/** Indicates an enum that can provide integers for each of its values. */
public interface MaskedFlag {
/** The mask value for an empty mask, i.e. no flags set. */
int EMPTY_MASK = 0;
/**
* Obtains the integer value for this enum which can be included in a mask.
*
* @return the integer value for combination into a mask
*/
int getMask();
/**
* The name of the flag.
*
* @return The name of the flag.
*/
String name();
/**
* Fetch the integer mask for all presented flags.
*
* @param <M> flag type
* @param flags to mask (null or empty returns zero)
* @return the integer mask for use in C
*/
@SafeVarargs
static <M extends MaskedFlag> int mask(final M... flags) {
if (flags == null || flags.length == 0) {
return EMPTY_MASK;
} else {
int result = EMPTY_MASK;
for (MaskedFlag flag : flags) {
if (flag == null) {
continue;
}
result |= flag.getMask();
}
return result;
}
}
/**
* Combine the two masks into a single mask value, i.e. when combining two {@link FlagSet}s.
*
* @param mask1 The mask to combine with mask2.
* @param mask2 The mask to combine with mask1.
* @return The combined mask value for the two passed masks.
*/
static int mask(final int mask1, final int mask2) {
return mask1 | mask2;
}
/**
* Fetch the integer mask for the presented flags.
*
* @param <M> flag type
* @param flags to mask (null or empty returns zero)
* @return the integer mask for use in C
*/
static <M extends MaskedFlag> int mask(final Collection<M> flags) {
if (flags == null || flags.isEmpty()) {
return EMPTY_MASK;
} else {
int result = EMPTY_MASK;
for (MaskedFlag flag : flags) {
if (flag == null) {
continue;
}
result |= flag.getMask();
}
return result;
}
}
/**
* Indicates whether the passed flag has the relevant masked flag high.
*
* @param flags to evaluate (usually produced by {@link #mask(org.lmdbjava.MaskedFlag...)}
* @param test the flag being sought (required)
* @return true if set.
*/
static boolean isSet(final int flags, final MaskedFlag test) {
requireNonNull(test);
return (flags & test.getMask()) == test.getMask();
}
}